| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | ABCO Builders | MEP engineering | 2 |
| 2 | ABF Consulting Engineers | MEP engineering | 1 |
| 3 | ABF Consulting Engineers | MEP engineering | 2 |
| 4 | Able Engineering Inc. | MEP engineering | 25 |
| 5 | Abraham Joselow Associates PC | MEP engineering | 5 |
| 6 | Abraham Joselow PE, PC | MEP engineering | 8 |
| 7 | ABS Consultants, Inc | MEP engineering | 8 |
| 8 | AB Teknoplan | MEP engineering | 3 |
| 9 | Ace Parking Management | MEP engineering | 6 |
| 10 | ACR Engineering, Inc. | MEP engineering | 6 |
| 11 | Adelt Mechanical Works | MEP engineering | 1 |
| 12 | Advanced Engineering, Inc. | MEP engineering | 1 |
| 13 | Adviesbureau vanderWeele | MEP engineering | 3 |
| 14 | Adviesbureau Wiecherink BV | MEP engineering | 1 |
| 15 | AECOM | MEP engineering | 2 |
| 16 | afaconsult | MEP engineering | 1 |
| 17 | Affiliated Engineers, Inc. | MEP engineering | 32 |
| 18 | A.G. Consulting Engineering PC | MEP engineering | 2 |
| 19 | A & G Engineering Ltd. | MEP engineering | 39 |
| 20 | Ajmani & Pamidi Inc. | MEP engineering | 10 |